Usually people can easily differentiate between day and night. Still, there can be exceptions. Thus, spending a night at the North Pole doesn’t mean it’ll be dark.

The following picture taken at 4 a.m. can prove it.

It is known that the North and South Poles have either no night for around six months of the year during summer, or complete night for six months of the year during winter. No night actually means no darkness. When it is always light you never know when it’s time to sleep. You can take a nap for some hours, get up after that and suddenly feel like sleeping for another couple of hours. A week at the Northern Pole is equal to a month somewhere else as one can take a nap for about 30 times a week.